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The scientists recommend that studies ________ to find out what side effects the medicine might cause.

A.be done B.should do

C.will be done D.are done

 

A

【解析】A [recommend后接宾语从句时,谓语动词用虚拟语气,should可以省略。此题中因为studies是动作的承受者,所以用被动形式。]

 

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